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September Weather in Wellington, United States

Last updated: June 24, 2025

The average temperature in Wellington, United States during September is a pleasant 18°C (64°F). Residents can experience a range, with minimums dipping to -2°C (29°F) and soaring highs reaching 36°C (97°F). Prepare for some rainfall, as 26 mm (1.0 in) of precipitation is expected over approximately 4 days of the month. With an average humidity of 63%, it's a time to embrace the refreshing atmosphere!

September Temperature in Wellington

In September in Wellington, the average temperature is 18°C (64°F). Maximums can reach 36°C (97°F) and minimums can be as low as -2°C (29°F). Be prepared for a wide range of temperatures and pack accordingly for your trip to Wellington this September.

September Weather in Wellington: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Wellington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wellington, September typically has an average temperature of 18°C (64°F), with highs reaching up to 36°C (97°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec302838455466727064473933
Data source: Temperature data for Wellington generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Wellington

In Wellington in September, the precipitation amount is 26 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Wellington

The chart displays monthly precipitation patterns in Wellington, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Wellington, September typically receives around 26 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec1624535411646353726362418
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wellington

In Wellington in September, humidity is 63%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, creating a sense of stickiness that may cause you to seek out shade or a refreshing drink while exploring the city’s sights.

September Average Humidity in Wellington

This chart illustrates the average monthly humidity levels in Wellington, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Wellington is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%86%75%67%67%68%62%63%63%72%80%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Wellington

In Wellington in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Wellington.

Maximum UV Index Levels in Wellington for September

The chart shows the monthly maximum UV Index (UVI) for Wellington in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Wellington typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111212119654
Data source: Wellington September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Wellington Compares to Other Months

Weather in Wellington varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Wellington, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Wellington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)16 mm (0.6 inches)84%moderate
February Weather-2°C (28°F)24 mm (0.9 inches)85%high
March Weather4°C (39°F)53 mm (2.1 inches)75%very high
April Weather7°C (45°F)54 mm (2.1 inches)67%very high
May Weather12°C (54°F)116 mm (4.6 inches)67%extreme
June Weather19°C (67°F)46 mm (1.8 inches)68%extreme
July Weather22°C (73°F)35 mm (1.4 inches)62%extreme
August Weather21°C (71°F)37 mm (1.5 inches)63%extreme
September Weather18°C (64°F)26 mm (1.0 inches)63%very high
October Weather8°C (47°F)36 mm (1.4 inches)72%high
November Weather4°C (40°F)24 mm (0.9 inches)79%moderate
December Weather0°C (33°F)18 mm (0.7 inches)85%moderate

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